—About
About me
Software engineer by day, building companies on the side — always looking for ways to create something useful.
I'm Gunawan Santoso, a software engineer based in Jakarta, Indonesia. I've spent the past several years working at companies like 
Shopee, 
Gojek, 
Waresix, and 
Sinarmas Group — building frontend systems, shipping products, and learning what it takes to create software that people rely on every day.
Outside of work, I founded 
Micro App Digital, where I create simple Android and iOS apps for everyday use, and co-founded 
Incrementum, a digital solutions company that helps businesses build and grow their online presence.
AI is a natural extension of the workflow — from faster prototyping to better code, it frees up energy for the decisions that actually matter. The craft stays human, the speed just gets multiplied.
Connect with me—Independent apps
54+ mobile apps — designed, coded, and shipped solo on Android and iOS.
PT Micro App Digital is my independent app studio, building focused, privacy-first mobile applications that solve everyday problems with clarity and craft — no bloat, no accounts, and data that stays on your device. Every product is taken end-to-end, from concept and design to code and release.
16 Personality Types, Big Five, Enneagram & DISC — one evolving profile with instant results, compatibility checks & shareable cards, free & offline
Private period & cycle tracker — flow, symptoms, mood & fertile window, with honest predictions, PIN lock, doctor-ready PDF & TTC mode, free & offline
Intermittent fasting tracker with live fat-burning/ketosis/autophagy stages, every schedule (16:8, OMAD, 5:2), weight tracking & streaks — fully free
See your whole week at a glance and plan it like a paper planner — capture tasks fast, set recurring schedules & subtasks, organize into lists, with device calendar events alongside. Free & offline
Record in high quality, then read it back as searchable text — on-device transcription with no time limits, tap a word to jump to that moment, edit (trim/split/merge) & background recording. Free & offline
Make your home screen yours — live widget editor with instant preview, curated wallpapers, one-tap icon packs, matching themes & charging animations — free & offline
Catalog everything you own — photos, values, serial numbers & receipts across rooms & properties, with barcode scan, warranty reminders & claim-ready PDF
Track every service, fuel-up, expense, document & reminder for unlimited vehicles — fuel/EV economy, photo records & PDF/CSV export, fully offline
Customizable watering & care reminders for every plant — organized by room, with smart schedules, an offline care library & a growth photo journal
Calm, private week-by-week pregnancy tracker with kick counter, contraction timer, weight & symptom logs, appointments, checklists & bump journal
Track feeding, meds, vaccines, weight, vet visits & grooming with a photo journal — unlimited pets, reminders & on-device records
Track transactions, manage budgets, and monitor multiple wallets in one simple app
Discover the richness of traditional Chinese calendar systems
Monitor screen time, set goals, and build healthier digital habits
Beautiful weather with animated illustrations, hourly forecast, and 10+ home widgets
Intermittent fasting timer & tracker with 17+ plans, schedules, and stats
Understand your cycle through four seasons with daily logging and insights
Simple stopwatch timer with labels, insights, and activity heatmap
Build lasting habits through small, consistent daily actions
Ishihara, Snellen, contrast & astigmatism — the complete offline eye test in 2 minutes
Private, on-device money manager with budgets, goals, debt, assets & net worth
Daily crossword challenges with 4 difficulty levels, hints, themes & stats
Test your internet against Cloudflare's 300+ global servers. Download, upload, ping, jitter — in 15 seconds. 30-day history with trend charts and CSV export
MBTI, Big Five, Enneagram & Love Language tests in one beautiful offline app
Test love compatibility 6 ways — name, zodiac, birthday, fingerprint, photo & quiz
Offline grocery lists, pantry tracker, budget — no account, no cloud
All-in-one productivity with todo list, Pomodoro timer, and timebox planner
Bright LED flashlight with compass, magnifier, SOS beacon, level, and ruler
Test your IQ, train your brain & track your score across 7 cognitive categories
Random spinner wheel, dice, coin, team maker & more decision tools for groups
Beautiful countdown timers for birthdays, trips, holidays & every moment that matters
Weekly meal planner with 300+ recipes, auto grocery lists & hands-free cooking mode — offline
Honest file cleaner with duplicate finder, storage analyzer, recycle bin & full file manager
10 scientific memory tests — digit span, Corsi block, N-back, Simon & more
8 scientific reaction tests — simple, choice, go/no-go, audio, memory & more
Track water intake with one tap. Smart reminders that stop when you reach your daily goal. 7 drink types, beautiful animated water vessel, 12 languages — fully offline
Make flashcards, study with spaced repetition. 4 modes (Flip, Quiz, Match, Type), streaks, achievements, 12 languages — fully offline
Create invoices, estimates, and receipts in 2 minutes. 10 templates, 30+ currencies, 100% offline
Calculate BMI, log weight & track wellness with 16 health calculators — private & offline
Classic 2048 with multiple modes, daily challenges, 8 themes & smooth animations
Effortlessly scan and process QR codes and barcodes instantly
Read, edit, merge, compress, sign & convert PDFs — 100% on-device, no uploads
A beautiful daily journal for writing, memories, photos and mood. Year in Pixels, On This Day flashbacks, streak tracking — 100% offline
Fast offline unit converter — 20 categories and 100+ units including length, weight, currency, BMI and cooking sizes
Beautiful Chinese almanac — daily lunar dates, Tung Shing, zodiac, festivals & auspicious-date finder, fully offline
Forgiving habit tracker with a habit-strength score, consistency grid, goals, routines & a living garden — 100% offline
Offline mind mapping with 6 layout modes, infinite canvas, focus mode, present mode, outline view & 15 templates
Track every book, time every session, save your favorite quotes. Year-in-Books cover grid, reading calendar, genre charts, 15 achievements. 100% offline, 12 languages
Chromatic tuner with one-cent accuracy + tap-tempo metronome. 30+ tunings, all unlocked, fully offline
—IT solutions
Incrementum
A digital solutions company that helps businesses design, build, and grow through technology.
PT Incrementum Digital Solutions is a digital solutions company I co-founded to help businesses with their technology needs — from web development and mobile apps to internal dashboards and e-commerce platforms. We also provide penetration testing and network security assessments to help clients identify vulnerabilities and strengthen their infrastructure before threats become problems.
What drives me.
Build with purpose
Every product should solve a real problem. I focus on utility over complexity — creating tools that genuinely improve how people work and live.
Put users first
Great software starts with understanding the people who use it. Clean interfaces, thoughtful interactions, and accessibility aren't afterthoughts — they're the foundation.
Grow incrementally
Whether it's a personal app or a client project, I believe in shipping early, iterating often, and letting real feedback guide the direction.